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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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Journal DOI :
Institude of Korean Electrical and Electronics Engineers
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Volume & Issues
Volume 19, Issue 4 - Dec 2015
Volume 19, Issue 3 - Sep 2015
Volume 19, Issue 2 - Jun 2015
Volume 19, Issue 1 - Mar 2015
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Design and Implementation of Multiband Internal Antenna for LTE Mobile Handset
Cho, Young Min ; Jung, Pil Hyun ; Yang, Woon Geun ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 124~132
DOI : 10.7471/ikeee.2015.19.2.124
In this paper, we proposed a multiband internal antenna for LTE mobile handset that could be used for mobile devices. The proposed antenna has a volume of
, ground plane size is
, and covers 9 service frequency bands including LTE(Long Term Evolution) band with VSWR(Vlotage Standing Wave Ratio) less than 3. With rapid change of technologies, people wants to include more function into one device. In addition, each country uses different frequency band for traffic service, it is necessary to design multiband antenna for mobile phone since traveling foreign country needs roaming. And if we can cover several services with one antenna, cost and volume needed for antennas are minimized. A HFSS (High Frequency Structure Simulator) of the Ansoft Corporation based on a finite element method is employed to analyze the proposed antenna in the design process and to compare the simulation and experimental results.
Performance Analysis of Policy-based QoS Algorithm in the IMS
Han, Seok-Jun ; Shon, Hyung-Doh ; Kang, Seung-Chan ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 133~141
DOI : 10.7471/ikeee.2015.19.2.133
The IMS is an architectural control framework for delivering IP multimedia services such as voice, video, audio and data, the IMS supports not only the mobile communication system but also the existing wired and wireless network based on IP. The network that is integrated by the IMS needs policy-based network management protocol for managing the limited network resources to provide efficient multimedia service. The IMS use additional device called PDF for efficient resource management, but the PDF only uses diameter which is one of the network management protocol such as SNMP and COPS. Many devices use various protocol to manage the limited network resources. There is an algorithm using a variety of protocols such as Diameter, COPS and SNMP to handle the resources management efficiently. We also analyze the performance using the proposed algorithm in the implemented IMS environment.
Implementation of a Sensor Fusion FPGA for an IoT System
Jung, Chang-Min ; Lee, Kwang-Yeob ; Park, Tae-Ryong ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 142~147
DOI : 10.7471/ikeee.2015.19.2.142
In this paper, a Kalman filter-based sensor fusion filter that measures posture by calibrating and combining information obtained from acceleration and gyro sensors was proposed. Recent advancements in sensor network technology have required sensor fusion technology. In the proposed approach, the nonlinear system model of the filter is converted to a linear system model through a Jacobian matrix operation, and the measurement value predicted via Euler integration. The proposed filter was implemented at an operating frequency of 74 MHz using a Virtex-6 FPGA Board from Xilinx Inc. Further, the accuracy and reliability of the measured posture were validated by comparing the values obtained using the implemented filters with those from existing filters.
Deblurring Algorithm for Vehicle Image Processing Using Sigma Variation of Bilateral Filter
Son, Hwi-Gon ; Kim, Hi-Seok ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 148~154
DOI : 10.7471/ikeee.2015.19.2.148
Automotive electronics system must alarm accurately in every moment. In order to apply vehicle's image recognition algorithms, it is necessary to preprocess the system quickly. In this paper, blurred image correction method that utilizes histogram equalization and bilateral filter using deviation for driver assist system's image processing is proposed. It forms 5-stage processes namely scaler, equalization, modified noise filter, blur decision and edge detector. Using the extracted proper, values in bilateral filter for driving environment occurred driver assist system, the proposed algorithm is much faster processing time compare to the previous methods in blurred within 10 pixel. Results of experiment which are run time and experimental PSNR results using MATLAB is obtained and verified that our proposed algorithm is more faster performance compare with the existing methods.
A Speed-up Method of Pedestrian Detection in Realtime Image
Lee, Yun-Gu ; Lee, Jae-Heung ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 155~159
DOI : 10.7471/ikeee.2015.19.2.155
In this paper, we propose a method for pedestrian detection in real time video and reducing the calculation time of the HOG features for pedestrian detection. When the pedestrian is detected in real-time image, the next frame is detected by using a previously detected region information. In addition, we used a PSO to detect a pedestrian may appear in a region other than a pedestrian is detected quickly. the performance was measured for MIT, INRIA dataset, showed a performance increase of about 82% than the conventional method.
Radar-based Security System: Implementation for Cluttered Environment
Lee, Tae-Yun ; Skvortsov, Vladimir ; Ka, Min-Ho ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 160~167
DOI : 10.7471/ikeee.2015.19.2.160
We present an experimental implementation of the inexpensive microwave security sensor that can detect both static and slowly moving objects in cluttered environment. The prototype consists of a frequency-modulated continuous wave radar sensor, control board or computer and software. The prototype was tested in a cluttered indoor environment. In case of intrusion or change of environment the sensor will give an alarm, determine the location of new object, change in its location and can detect a slowly moving target. To make a low-cost unit we use commercially available automotive radar and own signal processing techniques for object detection and tracking. The intruder detection is based on a comparison between current 'image' in memory and 'no-intrusion' reference image. The main challenge is to develop a reliable technique for detection of a relatively low-magnitude object signals hidden in multipath clutter echo signals. Various experimental measurements and computations have shown the feasibility and performance of the system.
A Study on FPGA Design for Rotating LED Display Available Video Output
Lim, Young-Sik ; Lee, Seung-Ho ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 168~175
DOI : 10.7471/ikeee.2015.19.2.168
In this paper, we propose FPGA design technique for rotating LED display device which is capable of displaying videos with the use of the afterimage effect. The proposed technique is made up of image data correction process based on inverse gamma correction and error diffusion, block interleaving process, and data serial output process. The data correction process based on inverse gamma correction and error diffusion is an image data correction step in which image data received are corrected by inverse gamma correction process to convert the data into linear brightness characteristics, and by error diffusion process to reduce the brightness reduction phenomenon in low-gray-level which is caused by inverse gamma correction. In the block interleaving process, the data of the frames entered transversely are first saved in accordance with entrance order, and then only the longitudinal image data are read. The data serial output process is applied to convert the parallel data in a rotating location into serial data and send them to LED Driver IC, in order to send data which will be displayed on high-speedy rotating LED Bar. To evaluate the accuracy of the proposed FPGA design technique, this paper used XC6SLX45-FG484, a Spartan 6 family of Xilinx, as FPGA, and ISE 14.5 as a design tool. According to the evaluation analysis, it was found that goal values were consistent with simulation values in terms of accurate operation of inverse gamma and error diffusion correction, block interleaving operation, and serialized operation of image data.
Research on In-band Spurious Evasion Techniques of Hybrid Frequency Synthesizer
Kim, Seung-Woo ; Yoo, Woo-Sung ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 176~185
DOI : 10.7471/ikeee.2015.19.2.176
The study aims to a design hybrid frequency synthesizer in spectrum analyzer and to propose new techniques designed for evasion of in-band spurious. The study focuses on calculating the exact location of multiple phase locked loop of hybrid frequency synthesizer and spurious of direct digital synthesizer to evade in-band spurious outside of frequency range that the user wants to see and thereby simulating technique to improve input related spurious of spectrum analyzer for algorithm. The proposed technique is designed to calculate spurious evasion algorithm in central processing system when in-band spurious arises, and to move output frequency of DDS(direct digital synthesizer) into the place where no in-band spurious exists thereby improving performance of frequency synthesizer. The study used simulation and result representation to prove the effectiveness of the proposed technique.
A Study on the Automatic Generation of Test Case Based on Source Code for Quality Improvement
Son, Ung-Jin ; Lee, Seung-Ho ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 186~192
DOI : 10.7471/ikeee.2015.19.2.186
This paper proposes an automatic generation technology of test case based on API in source code for software's quality improvement. The proposed technology is comprised of four processes which are analyzing source code by using the Doxygen open source tool, defining API specification by using analyzed results, creating test design, generating a test case by adapting Pairwise test technology. Analyzing source code by using the Doxygen open source tool is the phase in which API information in source code such as the API name, input parameter and return parameter are extracted. Defined API specification by using analyzed results is the phase where API informations, which is needed to generate test case, are defined as a form of database by SQLite database on the basis of extracted API information. Creating test design is the phase in which the scenario is designed in order to be composed as database by defining threshold of input and return parameters and setting limitations based on the defined API. Generating a test case by adapting Pairwise test technique is the phase where real test cases are created and changed into database by adapting Pairwise technique on the base of test design information. To evaluate the efficiency of proposed technology, the research was conducted by begin compared to specification based test case creation. The result shows wider test coverage which means the more cases were created in the similar duration of time. The reduction of manpower and time for developing products is expected by changing the process of quality improving in software developing from man-powered handwork system into automatic test case generation based on API of source code.
A Study On Radiation Detection Using CMOS Image Sensor
Lee, Joo-Hyun ; Lee, Seung-Ho ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 193~200
DOI : 10.7471/ikeee.2015.19.2.193
In this paper, we propose the radiation measuring algorithm and the device composition using CMOS image sensor. The radiation measuring algorithm using CMOS image sensor is based on the radiation particle distinguishing algorithm projected to the CMOS image sensor and accumulated and average number of pixels of the radiation particles projected to dozens of images per second with CMOS image sensor. The radiation particle distinguishing algorithm projected to the CMOS image sensor measures the radiation particle images by dividing them into R, G and B and adjusting the threshold value that distinguishes light intensity and background from the particle of each image. The radiation measuring algorithm measures radiation with accumulated and average number of radiation particles projected to dozens of images per second with CMOS image sensor according to the preset cycle. The hardware devices to verify the suggested algorithm consists of CMOS image sensor and image signal processor part, control part, power circuit part and display part. The test result of radiation measurement using the suggested CMOS image sensor is as follows. First, using the low-cost CMOS image sensor to measure radiation particles generated similar characteristics to that from measurement with expensive GM Tube. Second, using the low-cost CMOS image sensor to measure radiation presented largely similar characteristics to the linear characteristics of expensive GM Tube.
A Battery Charger Using Photovoltaic Energy Harvesting with MPPT Control
Yoon, Eun-Jung ; Yang, Min-Jae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 201~209
DOI : 10.7471/ikeee.2015.19.2.201
This paper describes a battery charger using photovoltaic energy harvesting with MPPT control. The proposed circuit harvests maximum power from a PV(photovoltaic) cell by employing MPPT(Maximum Power Point Tracking) control and charges an external battery with the harvested energy. The charging state of the battery is controlled according to the signals from a battery management circuit. The MPPT control is implemented using linear relationship between the open-circuit voltage of a PV cell and its MPP voltage such that a pilot PV cell can track the MPP of a main PV cell in real time. The proposed circuit is designed in a
CMOS process technology and its functionality has been verified through extensive simulations. The maximum efficiency of the designed entire system is 86.2% and the chip area including pads is
An Auto-Switching Energy Harvesting Circuit Using Vibration and Thermoelectric Energy
Yoon, Eun-Jung ; Yu, Chong-Gun ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 210~218
DOI : 10.7471/ikeee.2015.19.2.210
In this paper an auto-switching energy harvesting circuit using vibration and thermoelectric energy is proposed. Since the maximum power point of a thermoelectric generator(TEG) output and a vibration device(PEG) output is 1/2 of their open-circuit voltage, an identical MPPT controller can be used for both energy sources. The proposed circuit monitors the outputs of the TEG and PEG, and chooses the energy source generating a higher output voltage using an auto-switching controller, and then harvests the maximum power from the selected device using the MPPT controller. The proposed circuit is designed in a
CMOS process and its functionality has been verified through extensive simulations. The designed chip occupies
Conductivity Image Reconstruction Using Modified Gauss-Newton Method in Electrical Impedance Tomography
Kim, Bong Seok ; Park, Hyung Jun ; Kim, Kyung Youn ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 219~224
DOI : 10.7471/ikeee.2015.19.2.219
Electrical impedance tomography is an imaging technique to reconstruct the internal conductivity distribution based on applied currents and measured voltages in a domain of interest. In this paper, a modified Gauss-Newton method is proposed for conductivity image reconstruction. In the proposed method, the dimension of the inverse term is reduced by replacing the number of elements with the number of measurement data in the conductivity updating equation of the conventional Gauss-Newton method. Therefore, the computation time is greatly reduced as compared to the conventional Gauss-Newton method. Moreover, the regularization parameter is selected by computing the minimum-maximum from the diagonal components of the Jacobian matrix at every iteration. The numerical experiments with several scenarios were carried out to evaluate the reconstruction performance of the proposed method.
The Adaptive Maximum Power Point Tracking Control in Wind Turbine System Using Torque Control
Hyun, Jong-Ho ; Kim, Kyung-Youn ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 225~231
DOI : 10.7471/ikeee.2015.19.2.225
The parameter K which decides how much to convert wind energy to electric energy in MPPT(maximum power point tracking) control of wind turbine system using torque controller is changed because blade shape and air density change. If the parameter K is not optimal value, power lose occur. The changed parameter K is important issue in wind turbine system. In this paper, to solve this problem, considering wind turbine system using back-to-back converter control and torque control, we propose the adaptive MPPT algorithm which performs fast control by using initial K, estimates mechanical power using Kalman filter method, uses the estimated mechanical power as input for MPPT algorithm again, and consequently performs optimal MPPT control.
Design of Super-junction TMOSFET with Embedded Temperature Sensor
Lho, Young Hwan ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 232~236
DOI : 10.7471/ikeee.2015.19.2.232
Super-junction trench MOSFET (SJ TMOSFET) devices are well known for lower specific on-resistance and high breakdown voltage (BV). For a conventional power MOSFET (metal-oxide semiconductor field-effect transistor) such as trench double-diffused MOSFET (TDMOSFET), there is a tradeoff relationship between specific on-state resistance and breakdown voltage. In order to overcome the tradeoff relationship, a SJ TMOSFET structure is suggested, but sensing the temperature distribution of TMOSFET is very important in the application since heat is generated in the junction area affecting TMOSFET. In this paper, analyzing the temperature characteristics for different number bonding for SJ TMOSFET with an embedded temperature sensor is carried out after designing the diode temperature sensor at the surface of SJ TMOSFET for the class of 100 V and 100 A for a BLDC motor.
Smartphone Addiction Detection Based Emotion Detection Result Using Random Forest
Lee, Jin-Kyu ; Kang, Hyeon-Woo ; Kang, Hang-Bong ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 237~243
DOI : 10.7471/ikeee.2015.19.2.237
Recently, eight out of ten people have smartphone in Korea. Also, many applications of smartphone have increased. So, smartphone addiction has become a social issue. Especially, many people in smartphone addiction can't control themselves. Sometimes they don't realize that they are smartphone addiction. Many studies, mostly surveys, have been conducted to diagnose smartphone addiction, e.g. S-measure. In this paper, we suggest how to detect smartphone addiction based on ECG and Eye Gaze. We measure the signals of ECG from the Shimmer and the signals of Eye Gaze from the smart eye when the subjects see the emotional video. In addition, we extract features from the S-transform of ECG. Using Eye Gaze signals(pupil diameter, Gaze distance, Eye blinking), we extract 12 features. The classifier is trained using Random Forest. The classifiers detect the smartphone addiction using the ECG and Eye Gaze signals. We compared the detection results with S-measure results that surveyed before test. It showed 87.89% accuracy in ECG and 60.25% accuracy in Eye Gaze.
Video Stabilization Based on Smoothing Filter of Undesirable Motion
Kim, Beomsu ; Lim, Jinju ; Hong, Min-Cheol ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 244~253
DOI : 10.7471/ikeee.2015.19.2.244
Please This paper presents method of video stabilization based on detection and adaptive motion smoothing filtering of undesirable motion. The proposed algorithm consists of two stages: the detection of undesirable motion and smoothing filtering of detected undesired motion. To incorporate desired properties into the motion smoothing process, the local maximum and the local minimum are defined in a set composed of the parameters of accumulative global motion. Using the local information, the constraints on detecting undesirable motions are defined. Based on these constraints, the alpha parameter of the alpha-trimmed means filter is adjusted, so that the degree of motion smoothing in the reconstructed video sequence is controlled. The experimental results demonstrated the capability of the proposed algorithm.
Hardware Implementation of HEVC CABAC Context Modeler
Kim, Doohwan ; Moon, Jeonhak ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 254~259
DOI : 10.7471/ikeee.2015.19.2.254
CABAC is a context-based adaptive binary arithmetic coding method. It increases the encoding efficiency by updating the probability based on the information of the previously coded symbols. Context modeler is a core block of CABAC, which designs a probability model according to the symbol considering statistical correlations. In this paper, an efficient hardware architecture of CABAC context modeler is proposed. The proposed context modeler was designed in Verilog HDL and it was implemented in 0.18 um technology. Its gate count is 29,832 gates including memory. Its operating speed and throughput are 200 MHz and 200 Mbin/s, respectively.
A Mode Selector for Operation with Linear and Switching Regulator
Cho, Han-Hee ; Park, Kyeong-Hyeon ; Jung, Jun-Mo ; Koo, Yong-Seo ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 260~264
DOI : 10.7471/ikeee.2015.19.2.260
In this paper, we propose mode selector for operating a switching system and regulator of linear system to detect the load current. The proposed mode selector can be a mode switching of linear system and switching system, and it has been proposed to compensate for the disadvantages of regulator of switching system with low efficiency in light load conditions. At light load conditions, the mode selector is possible to provide a high efficiency in light load condition by switching the mode to the regulator of linear system. The mode selector was designed to using a Dongbu Hitek
A Study on the Electrical Characteristic of SCR-based Dual-Directional ESD Protection Circuit According to Change of Design Parameters
Kim, Hyun-Young ; Lee, Chung-Kwang ; Nam, Jong-Ho ; Kwak, Jae-Chang ; Koo, Yong-Seo ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 265~270
DOI : 10.7471/ikeee.2015.19.2.265
In this paper, we proposed a dual-directional SCR (silicon-controlled rectifier) based ESD (electrostatic discharge) protection circuit. In comparison with conventional SCR, this ESD protection circuit can provide an effective protection against ESD pulses in the two opposite directions, so the ESD protection circuit can be discharged in two opposite direction. The proposed circuit has a higher holding voltage characteristic than conventional SCR. These characteristic enable to have latch-up immunity under normal operating conditions as well as superior full chip ESD protection. it was analyzed to figure out electrical characteristics in term of individual design parameters. They are investigated by using the Synopsys TCAD simulator. In the simulation results, it has trigger voltage of 6.5V and holding voltage increased with different design parameters. The holding voltage of the proposed circuit changes from 2.1V to 6.3V and the proposed circuit has symmetrical I-V characteristic for positive and negative ESD pulse.
Design of Unified HEVC 4×4 IDCT/IDST Block
Jung, Seulkee ; Lee, Seongsoo ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 271~275
DOI : 10.7471/ikeee.2015.19.2.271
This paper proposes a unified HEVC
IDCT/IDST architecture for area reduction. In general,
IDST blocks are implemented separately, and they are connected with multiplexers. In the proposed arechitecture, these two blocks are unified, and internal hardware resources such as multipliers are shared. This reduces the chip area. The synthesized block in 0.18 um technology is 2,795 gates, and the gate count is reduced by 9.44% in comparison with conventional designs.
Case Study on Utilizing Arduino in Programming Education of Engineering
Park, Jang-Hyun ; Kim, Seong-Hwan ;
Journal of IKEEE, volume 19, issue 2, 2015, Pages 276~281
DOI : 10.7471/ikeee.2015.19.2.276
Engineers increasingly rely on computers and their computer programming skills for their works. As a result, most engineering curricula have introduced a computer programming courses. However, students consider the subject to be unrelated to their core interests and often feel uncomfortable when learning to program for the first time. To overcome these difficulties, several studies have proposed the use of physical computing paradigm. This paradigm takes the computational concepts out of the PC screen and into the real world so that the student can interact with them. This paper proposes Arduino platform as a tool for attracting interest of the programming and reports the results of questionnaire survey analysis.